text: //////////////////////////////////////////////////////////////////////////
  //
  //  Copyright (c) 2012, John Haddon. All rights reserved.
  //  Copyright (c) 2013, Image Engine Design Inc. All rights reserved.
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions are
  //  met:
  //
  //      * Redistributions of source code must retain the above
  //        copyright notice, this list of conditions and the following
  //        disclaimer.
  //
  //      * Redistributions in binary form must reproduce the above
  //        copyright notice, this list of conditions and the following
  //        disclaimer in the documentation and/or other materials provided with
  //        the distribution.
  //
  //      * Neither the name of John Haddon nor the names of
  //        any other contributors to this software may be used to endorse or
  //        promote products derived from this software without specific prior
  //        written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  //  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  //  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  //  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  //  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  //  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  //  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  //  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  //  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  //  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  //////////////////////////////////////////////////////////////////////////
  
  #ifndef GAFFERARNOLD_ARNOLDSHADER_H
  #define GAFFERARNOLD_ARNOLDSHADER_H
  
  #include "GafferScene/Shader.h"
  
  #include "GafferArnold/TypeIds.h"
  
  namespace GafferArnold
  {
  
  class ArnoldShader : public GafferScene::Shader
  {
  
  	public :
  
  		ArnoldShader( const std::string &name=defaultName<ArnoldShader>() );
  		virtual ~ArnoldShader();
  
  		IE_CORE_DECLARERUNTIMETYPEDEXTENSION( GafferArnold::ArnoldShader, ArnoldShaderTypeId, GafferScene::Shader );
  
  		/// Implemented for outPlug(), returning the parameter named in the "primaryInput"
  		/// shader annotation if it has been specified.
  		virtual Gaffer::Plug *correspondingInput( const Gaffer::Plug *output );
  		virtual const Gaffer::Plug *correspondingInput( const Gaffer::Plug *output ) const;
  
  		/// \todo Remove this version, and add `keepExistingValues = false` default
  		/// to version below.
  		void loadShader( const std::string &shaderName );
  		void loadShader( const std::string &shaderName, bool keepExistingValues );
  
  	private :
  
  		// Shader metadata is stored in a "shader" member of the result and
  		// parameter metadata is stored indexed by name inside a
  		// "parameter" member of the result.
  		const IECore::CompoundData *metadata() const;
  
  		mutable IECore::ConstCompoundDataPtr m_metadata;
  };
  
  IE_CORE_DECLAREPTR( ArnoldShader )
  
  } // namespace GafferArnold
  
  #endif // GAFFERARNOLD_ARNOLDSHADER_H
  